MANSONIA FLAVEOLUS 523 



more than its own length before anterior cross-vein ; scales of wing veins in two 

 series, lanceolate one3, overlaid by very broad, obliquely subtnmcate and sub- 

 ovate ones ; fringe unicolorous, pale brownish. 



Legs clothed with ochreous yellow scales ajid many dusky ones intermixed; 

 apices of first tarsal segments mostly dark scaled, on front and middle tarsi the 

 segments are mostly dusky scaled above ; on the middle pair the second segment 

 is broadly ringed with whitish at base, the third and fourth segments more nar- 

 rowly so; on the hind pair the second, third, and fourth segments are very 

 broadly ringed with whitish at bases, the fifth narrowly so. Claw formula, 

 3.0-2.0-0.0. 



Length : Body about 5.5 mm. ; wing 4.5 mm. 



Genitalia (plate 34, fig. 327) : Side-pieces over twice as long as wide, conical, 

 slightly constricted near middle, without lobes. Clasp-filament very stout and 

 thick, tapering to tip, a wing-shaped branch on inner side, serrate outwardly, 

 rounded at tip; a short, stout, terminal articulated spine at tip of filament. 

 Basal lobe represented by a long, stout smooth process, reaching well toward 

 tip of side-piece, slightly attenuated mesiaUy, bearing at tip two articulated 

 claws. Harpes elliptical, inner margin strongly revolute, tip recurved and 

 dentated. Unci forming a basal cylinder. N"o basal appendages. 



Life history and habits unknown. 



Lesser Antilles, West Indies. 



St. Thomas, Virgin Islands, August, 1905 (A. Busck) . 



Mansonia flaveolus is known only from the single type specimen. The wing 

 scales greatly resemble those of Mansonia titillans in character, but the broad 

 scales are proportionately smaller. 



